33987397 has 2 divisors, whose sum is σ = 33987398. Its totient is φ = 33987396.

The previous prime is 33987383. The next prime is 33987419. The reversal of 33987397 is 79378933.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26152996 + 7834401 = 5114^2 + 2799^2 .

It is a cyclic number.

It is not a de Polignac number, because 33987397 - 2⁷ = 33987269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 33987397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33987337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16993698 + 16993699.

It is an arithmetic number, because the mean of its divisors is an integer number (16993699).

Almost surely, 2^33987397 is an apocalyptic number.

It is an amenable number.

33987397 is a deficient number, since it is larger than the sum of its proper divisors (1).

33987397 is an equidigital number, since it uses as much as digits as its factorization.

33987397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 49.

The square root of 33987397 is about 5829.8710963451. The cubic root of 33987397 is about 323.9211469186.

The spelling of 33987397 in words is "thirty-three million, nine hundred eighty-seven thousand, three hundred ninety-seven".